code: def test_default():
      hammer = ccrs.Hammer()
      other_args = {"a=6378137.0", "lon_0=0"}
      check_proj_params("hammer", hammer, other_args)
  
      assert_almost_equal(
          hammer.x_limits, [-18040095.6961473, 18040095.6961473]
      )
      assert_almost_equal(
          hammer.y_limits, [-9020047.8480736, 9020047.8480736]
      )
  
file_path: cartopy/lib/cartopy/tests/crs/test_hammer.py
imports: import numpy
  from numpy.testing import assert_almost_equal
  import pytest
  import cartopy.crs
  from .helpers import check_proj_params
label_desc: Use image node_id 1 for calling a global function with example usage: test_default() without return types